Method and means for moving a shiftable holder for a roll core or the like

ABSTRACT

Two oil pressure cylinders are disposed on both sides of a roll core. Each cylinder has a piston and a piston rod which is connected to the end of the roll core. Oil pressure pipes are connected between the roll core-side end of each cylinder and an oil pressure actuator for shifting the roll core. Additional oil pressure pipes are connected between the other end of each cylinder and another actuator for chucking to hold the roll core.

0 United States Patent 11 1 [111 3,810,590 Miyake [45] May 14, 1974 [54] METHOD AND MEANS FOR MOVING A 2,967,675 111961 Markey 242 57.1 SHIFTABLE HOLDER FOR A ROLL CORE 2,915,533 :(2)/l959 Bruns i 242/78.6 OR THE LIKE 3,058, /1962 Wagner 24/78.6 X [75] Inventor: Yoshiaki Miyake, Kanagawa, Japan FOREIGN PATENTS OR APPLICATIONS 22,852 7/1956 Germany 242/68.2 [73] Assignee: Fuji Photo Film Co., Ltd.,

Kanagawa Japan Primary Examiner-John W. Huckert 22 i May 25, 1972 Assistant Examiner-Edward J. McCarthy Attorney, Agent, or Firm-Sughrue, Rothwell, Mion, [2i] Appl. No.: i & Macpeak [30] Foreign Application Priority Data [57] ABSTRACT May 27, l97l Japan 46-36433 Two oil pressure cylinders are disposed on both sides of a roll core. Each cylinder has a piston and a piston {52] US. Cl. 242/68.4 rod which is connected to the end of the roll core Oil [51] Int. Cl B65h 19/02 pressure pipes are connected between the roll core- [58] Field of Search 242/68.4, 57.1, 78.6, 129.51, side end of each cylinder and an oil pressure actuator 242/68, 56.8; 279/4 for shifting the roll core. Additional oil pressure pipes are connected between the other end of each cylinder [56] References Cited and another actuator for chucking to hold the roll UNITED STATES PATENTS core' 2.800.288 7/1957 Bandy 242/78.6 5 Claims, 5 Drawing Figures BACKGROUND OF THE INVENTION l. Field of Invention This invention relates to a method and a means for shifting a roll core or the like while holding the roll core and more particularly to those in which the holding of the roll core is never loosened even when the roll core is shifted.

2. Description of the Prior Art In the prior holder for a roll core which could be shifted, for example, of a turret, a roll core was generally chucked at both ends thereof and being held in place by an oil pressure actuator. It was, however, difficult to provide a difference between the pressures for the chuck of the roll core and at the same time maintain the chuck of the roll core. That is, to provide a difference between the oil pressure applied to the left side and the right side pistons and yet maintain sufficient pressure to hold the roll core securely. Therefore, with conventional core holders the chucking pressures for the roll core were decreased during the shift of the roll core and therefore, the roll core often fell off the turret. It is difficult to keep the escape-side oil pressure greater than the pressure needed to maintain the chuck of the roll core and simultaneously less than the pushside oil pressure. In order to overcome this difficulty, in certain conventional cases, oil escape-pipes have been provided in oil pipe lines. However, these oil escape-pipes do not effectively prevent a loosening of the roll core when it is shifted to the left or right end.

This invention has as an object the intention of overcoming the above-mentioned disadvantage in the prior art shiftable holder for a roll core.

Accordingly, an object of this invention is to provide a method and means for moving a shiftable holder for a roll core which does not result in a loosening in the holding of the roll core.

Another object of this invention is to provide a shiftable holder for a roll core in which it is possible to independently shift the roll core by adding independently, a shift pressure thereto while maintaining the left side and the right side chucking pressures at the same strength for the roll core which are applied to both ends of the roll core as the chucks.

SUMMARY OF THE INVENTION In the method for moving a shiftable holder for a roll core according to this invention, the chucking pressures for the roll core are obtained by applying pressure to pressure-cylinders, which are provided on both'sides of the roll core, on the opposite side thereof to the side on which the end of the roll core faces. The roll core is shifted by applying slight pressure to the pressurecylinders on the side thereof on which the end of the roll core faces.

Furthermore, the shiftable holder for a roll core according to this invention includes pressure-cylinders disposed at both ends of a roll core, pistons provided in the pressure-cylinders, each of which has a piston rod (used as a chucking rod, in one embodiment), and a pressure medium feed means provided at the ends of each pressure-cylinder to transmit the pressure medium to both sides of the piston in each pressurecylinder. I

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of the prior shiftable holder for a roll core;

FIGS. 2 to 4 are schematic diagrams for illustrating the right-ward shift of the roll core in the FIG. 1 shifting holder; and

FIG. 5 is a schematic diagram of the shiftable holder for a roll core according to this invention.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 illustrates the prior art shiftable holder for a roll core, for example, in a turret, wherein l is a roll core, 2 and 3 are oil pressure-cylinders with pistons 4 and 5 therein to which chucking rods 6 and 7 are connected, 8 and 9 are oil pressure pipes for spreading the rod span, 10 and 11 are oil pressure pipes for reducing the rod span, 13 and 14 are throttles, 12 and 15 are chuck valves, and 16 is an oil pressure actuator. In such a system, the chucking pressure for holding the roll core 1 and the pushing pressure to shift it are provided through pistons 4 and 5 by oil pressure. However, as previously described, the system has the fatal defect that the roll core 1 falls off when it is shifted because it is very difficult to generate a difference between the oil pressures applied to both ends of the roll core 1 and yet maintain sufficient chucking pressures to hold the roll core tightly. In order to overcome this difficulty, for example, when the roll core 1 is shifted to the right, the chuck valve 12 and the throttle 13 are provided in the pipe 10 on the oil-escape side, so that the oil-escape side pressure in the cylinder 2 is lower than the oil-push side pressure in the cylinder 3 because the oilescapes against the resistance of the throttle l3 and the oil cannot escape through the chuck valve 12. Therefore, it was expected that the chucking pressure for the roll core 1 is maintained in the cylinder 2 sufficient enough to hold it.

However, when the roll core is shifted all the way to the left end or the right end, the throttle and the chuck valve are not effective in maintaining the pressure to chuck the roll core because there is no oil in the cylinder 2. Consequently, the roll core is loosened and in some severe cases, the core has fallen to the floor and harmed the operator. In referring to FIGS. 2 through 4, an explanation of the looseness which is caused when the roll core 1 is positioned at the center of the turret and is at the point of moving to the right, is provided. The operating pressure-oil is fed via the pipe 11 in the direction denoted by the arrow B and enters into the cylinder 3, so that the chucking pressure is applied to the roll core 1 through the piston 5 and the rod 7. The oil pressure in the cylinder 2 has a pressure lower than the pressure of the oil in the cylinder 3. When the roll core 1 is pushed by the high-pressure oil in the cylinder 3, the oil in the cylinder 2 escapes through the pipe 10, but it is necessary that its pressure be greater than the pressure needed to provide the chucking pressure to the roll core I. The oil in the pipes 8 and 9 flows in the direction denoted by the arrows D and E respectively and may have the same pressure as atmospheric pressure.

FIG. 3 shows the condition in which the roll core 1 begins to be shifted to the right of the center of the turret. That is, the high-pressure oil is fed through the pipe 11 in the direction denoted by the arrow B, passing through the throttle 14 and the chuck valve 15, and enters into the cylinder 3, so that the chucking pressure is applied to the roll core 1 through the piston and the rod 7. This shifts the roll core 1 to the right against the oil pressure in the cylinder 2. The oil pushed out of the cylinder 2 by the piston 4 flows through the throttle 13, against the resistance of the throttle and does not flow through the chuck valve 12, so that the pressure in the cylinder 2 is to be higher than the pressure needed for chucking the roll core.

When the piston 5 has reached the right end of the cylinder 3, the roll core 1 stops shifting to the right and therefore the oil in the cylinder 2 is no longer pushed so that it flows out. Accordingly, it becomes impossible for the throttle 13 to maintain a pressure greater than the chucking pressure, so that the chucking pressure needed to hold the roll core 1 in place is not applied to it through the rods 6 and 7. Thus, the roll core 1 will be loosened in the turret or, at the worst, will fall off.

This invention overcomes the above-described de- 'fects in the prior shiftable holder for a roll core, and

will be described in detail with reference to FIG. 5. in the drawing, 21 is a roll core, 22 and 23 are oil cylinders, 24 and 25 are pistons, to which chucking rods 26 and 27 are connected, 28 and 29 are pipes for spreading the rod span and for shifting the roll core 21, 30 and 31 are pipes for chucking the roll core 21, 36 is an actuator for feeding a pressure-liquid to the pipes 30 and 31, and 37 is another actuator for feeding a pressureliquid to the pipes 28 and 29.

In operation, a pressure-liquid is fed into the cylinder 22 and 23 through the pipes 30 and 31, respectively, by the actuator 36, so that the roll core 21 is supplied with the chucking pressure through pistons 24 and 25 and rods 26 and 27, and is held in a chucked condition. According to the distribution of the pressure-liquid fed from the actuator 37 into the pipes 28 and 29, the roll core 21 is shifted either to the left or to the right. That is, if the liquid pressure in pipe 29 is increased over that in the pipe 28, the roll core 21 will be shifted to the left, and if the liquid pressure in the pipe 28 is increased over that in the pipe 29, the roll core 21 will be shifted to the right.

According to this invention, the roll core can be shifted smoothly while sufficiently maintaining the chucking pressure enough to be held, even though there is no throttle and no chuck valve. Moreover, even if the roll core reaches the end of its shift-course, the

- chucking pressure for the roll core will be supplied as before by the actuator 36 independently of the shifting pressure supplied by the actuator 37, so that it will be impossible for the roll core to be loosened or further, to fall. 7

Furthermore, it is possible to shift the roll core by a slight pressure and therefore, to shift it slightly or smoothly. Accordingly, and additionally, because of Although the present invention has been adequately described in the foregoing specification and drawings, it is readily apparent that various changes and modifications can be made without departing from the spirit and scope thereof.

What is claimed is:

' l. A shiftable holder for a roll core comprising:

two pressure-cylinders, one disposed at each end of said roll core;

pistons provided in each of said pressure-cylinders, said pistons each having a first face disposed away from said roll core and a second face facing said roll core;

piston rods connected .to eachof said pistons and to the opposite ends of said roll core;

first and second separate pressure medium feed means provided at each end of each of said cylinders for feeding a pressure medium into said cylinders on both sides of each of said pistons against said first and second faces, respectively; and

first and second separate and independent actuator means for actuating feeding of said pressure medium through said first and second feed means, respectively, whereby pressure against said first face maintains chucking pressure by said piston rods against said roll core and whereby pressure against said second face causes lateral shifting of said roll core.

2. The shiftable holder of claim 1 consisting of said two pressure-cylinders, said pistons, said piston rods, said first and second separate pressure medium feed means and said first and second separate and independent actuator means.

3. The shiftable holder of claim 1, wherein said faces of said pistons each have substantially the same surface area.

4. A method for moving a shiftable holder for a roll core while maintaining chucking pressure against said roll core, said method comprising:

1. applying chucking pressure to both ends of said roll core through piston rods at each end of said roll core, which piston rods are each connected to pistons disposed in respective pressure-cylinders at the respective ends of said roll core, said pistons each having a first face disposed away from said roll core and a second face facing said roll core, said chucking pressure being applied to said first face by means of a fluid pressure medium;

2. applying pressure to said second face with a fluid pressure medium to shift said roll core; and

3. applying pressure in said step 1 independently of the pressure applied in said step 2 employing separate and independent actuator means for controlling the pressures applied to each of said first and second faces, whereby said roll core is shifted while maintaining constant chucking pressure against said roll core.

5. The method of claim 4, wherein the pressure applied to the first face of both pistons is substantially equal in magnitude and substantially opposite in direction. 

1. A shiftable holder for a roll core comprising: two pressure-cylinders, one disposed at each end of said roll core; pistons provided in each of said pressure-cylinders, said pistons each having a first face disposed away from said roll core and a second face facing said roll core; piston rods connected to each of said pistons and to the opposite ends of said roll core; first and second separate pressure medium feed means provided at each end of each of said cylinders for feeding a pressure medium into said cylinders on both sides of each of said pistons against said first and second faces, respectively; and first and second separate and independent actuator means for actuating feeding of said pressure medium through said first and second feed means, respectively, whereby pressure against said first face maintains chucking pressure by said piston rods against said roll core and whereby pressure against said second fAce causes lateral shifting of said roll core.
 2. The shiftable holder of claim 1 consisting of said two pressure-cylinders, said pistons, said piston rods, said first and second separate pressure medium feed means and said first and second separate and independent actuator means.
 2. applying pressure to said second face with a fluid pressure medium to shift said roll core; and
 3. applying pressure in said step 1 independently of the pressure applied in said step 2 employing separate and independent actuator means for controlling the pressures applied to each of said first and second faces, whereby said roll core is shifted while maintaining constant chucking pressure against said roll core.
 3. The shiftable holder of claim 1, wherein said faces of said pistons each have substantially the same surface area.
 4. A method for moving a shiftable holder for a roll core while maintaining chucking pressure against said roll core, said method comprising:
 5. The method of claim 4, wherein the pressure applied to the first face of both pistons is substantially equal in magnitude and substantially opposite in direction. 